The West Antarctic Ice Sheet is showing nearly twice as much warming as previously thought, according to a new study co-written by a researcher at the National Center for Atmospheric Research.

The discovery, published Sunday in the journal Nature Geoscience, raises additional concerns about the degree to which Antarctica will contribute to sea level rise.

“If this melt continues, if the summer warming continues, we could begin to see increased runoff from the West Antarctic Ice Sheet later in the century that could enhance its ongoing contribution to sea-level rise,” said Andy Monaghan, the NCAR climatologist who co-authored the study.

The research, which builds upon Monaghan’s doctoral work at Ohio State University in 2008, was also co-authored by his doctoral advisor, OSU professor of geography David Bromwich, who is also a senior research scientist at the Byrd Polar Research Center.

KANSAS CITY, Mo. — Tyreek Hill had touchdowns receiving and on a punt return, Kansas City’s defense made life miserable for Oakland quarterback Derek Carr, and the Chiefs beat the Raiders 21-13 on a frigid Thursday night to take control of the AFC West. Charcandrick West also had a touchdown run for the Chiefs (10-3). They moved into a first-place...